1. https://hearinghealthfoundation.org/hearing-loss-tinnitus-statistics
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3. Simonetti, P., Vasconcelos, L. G., &Oiticica, J. (2018). Effect of fractal tones on the improvement of tinnitus handicap inventory functional scores among chronic tinnitus patients: an open-label pilot study. International archives of otorhinolaryngology, 22(04), 387-394
4. McNeill, C., Távora-Vieira, D., Alnafjan, F., Searchfield, G.D., Welch, D. (2012). Tinnitus pitch, masking, and the effectiveness of hearing aids for tinnitus therapy. International Journal of Audiology, 51, 914-919.